Tubular rivet.



Patented Nov. l9, 190i.

W. C. 81. M. N. BRAY.

TUBULAR RIVET.

(Application filed. Sept. 14. 1901.)

(No Model.)

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. UNrrnn STATES PATENT FFIQE;

\VILLIAM C. BRAY, OF NEWTON, AND MELLEN N. BRAY, OF BOSTON, MASSA-CHUSETTS, ASSIGNORS TO TUBULAR RIVET AND STUD COMPANY, OF BOSTON,MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

TUBULAR RIVET.

SPECIFICATION forming part of Letters Patent No. 686,932, dated November19, 1901.

Application filed September 14, 1901. Serial No. 75,369- (No model.)

T at whom it may concern:

Be it known that we, WILLIAM C. BRAY, residing at Newton, in the countyof Middlesex, and MELLEN N. BRAY, residing at Boston, in

the county of Suffolk, State of Massachusetts,

have invented certain new and useful Improvements in Tubular Rivets, ofwhich the following is a specification.

The invention relates to that class of tubu- 1o lar rivets in which acap is secured to the end of the rivet-shank by expanding or spreadingthe end of the shank into an annular recess formed in the cap.

The object of the invention is to secure an 1 5 efiective and evenspreading of the end of the rivet-shank within the cap and also toenable the use of a stronger rivet-shank than heretofore. These objectsare secured by providing the rivet-cap with a spreader having ribsthereon for splitting the end of the rivetshank, and thus defining thelines on which the shank will divide in expanding Within the recess inthe cap.

A further object of the invention is to pro- 2 5 vide a cap which maycorrespond in shape to the head of the rivet, so that both ends of therivet when in place in the material may have the same appearance. Thisis done by decreasing the thickness of the cap about its center to formthe spreader. With the spreader thus formed the outer surface of the capmay be fiat, convex, or of other form to correspond to the shape of therivet-head.

The features of the invention will be made more clear by reference tothe accompanying drawings, in which--- Figure 1 is an elevation of thebody of a rivet. Fig. 2 is a sectional view of a cap embodying thefeatures of the invention. Fig. 3 is a plan view of Fig. 2. Fig. 4 is alongitudinal sectional view of the rivet with the cap secured to theshank. Fig. 5 is a plan view of the blank from which the cap is formed;and Fig. 6 is a sectional view on line 6 6, Fig. 5.

The body of the rivet shown in the drawings comprises a tubular shank aand a head I), which has a fiat outer surface, the rivet being aflat-headed rivet. In using the rivet the shank is passed through thematerials and a cap 0 is secured to the end of the shank.

This cap is provided with a central spreader d, which enters the end ofthe rivet-shank as the cap and body of the rivet are forced together andcauses the end of the rivet-shank to expand or spread outward into theannular 5 5 recess e, surrounding the spreader and formed by theinwardly-extending lip or flangef of the cap. The spreader is providedwith ribs g, which act to split the end of the shank a and determine thelines on which it shall divide as it is expanded by the spreader d. Thusthe proper and even spreading of the end of the shank is assured. Thedividingribs also facilitate the splitting of the end of the rivetshank,thus enabling the walls of the rivet-shank to be strengthened, either byincreasing their thickness or by using a tougher metal.

In forming the cap it is preferred to strike up the blank, as shown inFigs. 5 and 6, the spreader being formed by reducing the thickness ofthe surrounding metal and the surface of the blank opposite the spreadercorresponding to the form of the rivet-head, being flat in theconstruction shown. The blank is then formed into the cap 0 in the usualmanner. With this construction both ends of the rivet may have the sameappearance when the parts are assembled, a strong and effective spreaderis provided for expanding the rivet-shank, and the parts may beassembled by the use of fiat and inexpensive dies or anvils.

The number of ribs on the spreader may be varied; but thenumbershownhasbeenfound to give satisfactory results and is preferably used.

The ribs 9 lie between the divisions in the rivetshank and will assistin securing the cap and rivet-body in fixed relation by preventing anyturning of the cap on the shank.

What we claim, and desire to secure by Letters Patent, is-

l. A cap for a tubular rivet having a spreader for expanding the end ofthe rivetshank, and ribs on the spreader for determining the lines onwhich the rivet-shank will divide, substantially as described.

2. A cap for a tubular rivet having a spreader of greater thickness thanthe sur- I00 rounding Wall of the cap, ribs on the spreader I Intestimony whereof we have affixed our for determining the lines on whichthe rivetsignatures in presence of two witnesses. shank will divide,substantially as described.

. WILLIAM C BRAY.

3. A tubular rivet comprising a body por- T 5 tion having a tubularshank, a cap provided MELLEN 4 Witnesses:

F. A. EDMANDS,

M. E. GROOKER.

with a spreader, and ribs on the spreader dividing the end of the shank,substantially as described.

